.....
I have read some more articles and whatched really closely
As shown on the above illustration of an HTTP response (and more), there is supposed to be an empty line finishing the header.
A lot makes sence now: Apperantly the client received my HTTP header and immediately got the global variabels from the first lines of the javascript code.
But because I don't make endlines in bewteen or above mentioned variables, the client interpretates them as part of the header that just could not be resolved to anything....
So after adding this little small endline AND including the Content-length parameter within the header everything is functioning just fine 
Thanks again for all the suggestions they really helped back on the track and got me figuring out what exactly it is that I am searching for, so I can google it more efficiently 